package com.itheima.reggie.filter;

/**
 * @author kcs
 * @date 2021/11/17
 * @TIME:16:27
 */

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的url
        String requestURI = request.getRequestURI();// /backend/.index.html
        log.info("拦截到请求:{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls =new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/upload",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs",
                "swagger-ui.html"
        };

        //2.判断本次的请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理,则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断登录状态,如果已登录,则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("employee"));
            Long employeeId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employeeId);
            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录,用户id为:{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5.如果未登录则返回未登录结果,通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }



    /*@Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取请求uri
        String uri = request.getRequestURI();
        //判断是否要放行
        if(uri.equals("/employee/login") || uri.equals("/backend/page/login/login.html")){
            filterChain.doFilter(request,response);
            return;
        }
        //判断是否已登录
        HttpSession session = request.getSession();
        Long employee = (Long) session.getAttribute("employee");
        if(employee == null){
            response.sendRedirect("/backend/page/login/login.html");
            return;
        }
        //放行
        filterChain.doFilter(request,response);
    }*/


}
